Question

13, Give reasons; Potassium and sodium both have valency one but potassium is more reactive than a. sodium. b. As you move left to right in a period the atomic size decreases. Fluorine is more reactive than Chlorine in spite of having same valency. d. 18th group in the modern periodic table is also called the zero group..

Answer 1

Answer:

(a) Al has the highest valency of 3. As it belongs to group III A , it has 3 electrons in its valence shell. So, its valency is 3.

(b) Na has the largest atomic radius as the atomic radius decreases across the period.

(c) As, we move from left to right in a period the chemical reactivity of a metal decreases and of non metal increases. Here given are metals and hence Na is most reactive as it is the first element of period 3.

Answer 2

(a) Al has the highest valency of 3. As it belongs to group III A , it has 3 electrons in its valence shell. So, its valency is 3.

(b) Na has the largest atomic radius as the atomic radius decreases across the period.

(c) As, we move from left to right in a period the chemical reactivity of a metal decreases and of non metal increases. Here given are metals and hence Na is most reactive as it is the first element of period 3.

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